Normally it means the alternator is failing.
not charging the battery properly... check the alternator.
There is a battery light above the engine temperature gauge
park light circuit.
That's the overdrive off light
my battery is new for mercery mistque 1999 but the light on the dash board goes on and off why
I have a 98 mystique, and when the check engine light comes on, I simply disconnect the positive battery terminal for a couple of minutes. When I replace it, the check engine light is cleared. It resets the computer.
Ignition switch may be defective.
Possible alternator problem
Check engine light usually indicates a problem in the emission control system - have vehicle scanned to determine the problem
A malfunction has been detected
More than likely your alternator is getting ready to go out.
This light is warning you that there may be a problem with your battery. Have it checked.